Have effect (4)
I believe the answer is:
tell
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">have effect</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this in another clue)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for tell that I've seen before include "Count - recount" , "Legendary Swiss crossbowman and folk hero" , "Narrate; inform" , "Apprise" , "Relate (a story)" .)